"On the initiative of the nationalistic publisher J. F. Lehmanns (1864-1935), Erwin Baur (1875-1933), Eugen Fischer (1874-1967) und Fritz Lenz (1887-1976) came together to publish a comprehensive textbook on Human Heredity and Racial Hygiene in 1921 ... For the first time a geneticist, an anthropologist and a hygienist had joined forces to give a synopsis over the current knowledge about human heredity and racial hygiene. Their textbook consisted of two volumes and five different editions were published between 1921 and 1940 ... To open the first volume, Erwin Baur presents an overview of the general theory of inheritance ... Following this, Fischer describes the varying characteristics of human beings, applying anthropological criteria. On this basis he classifies different human races. It is an important fact that he points out hereditary criteria in characterising races in contrast to the classical anthropology which merely used to compare anatomical proportions."